The AXA Newton ProMoto ART5 – 100cm/8.5mm is approved for all-risk ensurance. The lock weighs around 6 kilos so it’s not a lock to take with you on small trips. The lock comes with two special non-copy keys. There is a international online keyservice that will provide you a new key in case you lost both original ones.
The AXA Newton ProMoto ART 5 – 100 cm is probably the best flexible lock money can buy.